/* ─── Learning Material ─────────────────────────────────────── */

/* ── List Modal ────────────────────────────────────────────── */
.lm-modal {
  max-width: 560px;
  width: 100%;
}

.lm-modal-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 6px;
}

.lm-modal-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(var(--accent-rgb), 0.12);
  border: 1px solid rgba(var(--accent-rgb), 0.28);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.lm-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
  max-height: 55vh;
  overflow-y: auto;
  padding-right: 4px;
}

.lm-list::-webkit-scrollbar { width: 5px; }
.lm-list::-webkit-scrollbar-track { background: transparent; }
.lm-list::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 99px; }

.lm-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.18s, border-color 0.18s, transform 0.15s, box-shadow 0.18s;
  text-align: left;
  width: 100%;
  color: var(--text);
  position: relative;
  overflow: hidden;
}

.lm-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.04) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.2s;
}

.lm-item:hover {
  background: var(--surface3);
  border-color: rgba(var(--accent-rgb), 0.35);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.25), 0 0 0 1px rgba(var(--accent-rgb), 0.12);
}

.lm-item:hover::before { opacity: 1; }
.lm-item:active { transform: translateY(0); }

.lm-item-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.lm-item-icon.docx {
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid rgba(37, 99, 235, 0.22);
}

.lm-item-icon.pdf {
  background: rgba(var(--hard-rgb), 0.1);
  border: 1px solid rgba(var(--hard-rgb), 0.22);
}

.lm-item-info {
  flex: 1;
  min-width: 0;
}

.lm-item-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  font-family: 'Syne', sans-serif;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 3px;
}

.lm-item-meta {
  font-size: 10px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.lm-item-badge {
  font-size: 9px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 99px;
  flex-shrink: 0;
}

.lm-item-badge.docx {
  background: rgba(37, 99, 235, 0.12);
  color: #60a5fa;
  border: 1px solid rgba(37, 99, 235, 0.22);
}

.lm-item-badge.pdf {
  background: rgba(var(--hard-rgb), 0.1);
  color: var(--hard-light);
  border: 1px solid rgba(var(--hard-rgb), 0.22);
}

.lm-item-badge.web {
  background: rgba(16, 185, 129, 0.1);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.22);
}

.lm-item-icon.web {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.lm-item-arrow {
  color: var(--text-muted);
  font-size: 14px;
  flex-shrink: 0;
  transition: transform 0.2s, color 0.2s;
}

.lm-item:hover .lm-item-arrow {
  transform: translateX(3px);
  color: var(--accent);
}

.lm-empty {
  text-align: center;
  padding: 32px 16px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
}

/* ── Fullscreen Viewer Modal ───────────────────────────────── */
#lm-viewer-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(0,0,0,0.92);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  will-change: opacity;
  transform: translateZ(0);
}

#lm-viewer-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.lm-viewer-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.lm-viewer-back {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 12px;
  color: var(--text-dim);
  font-size: 12px;
  font-family: 'JetBrains Mono', monospace;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.12s;
}

.lm-viewer-back:hover {
  background: var(--surface3);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateX(-2px);
}

.lm-viewer-back:active { transform: translateX(0); }

.lm-viewer-title {
  flex: 1;
  font-size: 14px;
  font-weight: 700;
  font-family: 'Syne', sans-serif;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lm-viewer-badge {
  font-size: 9px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 9px;
  border-radius: 99px;
  flex-shrink: 0;
}

.lm-viewer-badge.docx {
  background: rgba(37, 99, 235, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(37, 99, 235, 0.28);
}

.lm-viewer-badge.pdf {
  background: rgba(var(--hard-rgb), 0.1);
  color: var(--hard-light);
  border: 1px solid rgba(var(--hard-rgb), 0.25);
}

.lm-viewer-badge.web {
  background: rgba(16, 185, 129, 0.12);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.28);
}

/* ── Zoom controls ── */
.lm-zoom-controls {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 3px 5px;
  flex-shrink: 0;
}

.lm-zoom-btn {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
  flex-shrink: 0;
}

.lm-zoom-btn:hover {
  background: var(--surface3);
  color: var(--accent);
}

.lm-zoom-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-muted);
  min-width: 38px;
  text-align: center;
  user-select: none;
}

.lm-viewer-close {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.lm-viewer-close:hover {
  background: rgba(var(--hard-rgb), 0.1);
  border-color: rgba(var(--hard-rgb), 0.4);
  color: var(--hard);
}

.lm-viewer-body {
  flex: 1;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  width: 100%;
}

/* ── Loader ── */
.lm-viewer-loader {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: var(--bg);
  z-index: 2;
  transition: opacity 0.3s;
  pointer-events: none;
}
.lm-viewer-loader.hidden { opacity: 0; pointer-events: none; }

/* ── Error box ── */
.lm-viewer-error {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--bg);
  z-index: 3;
  text-align: center;
  padding: 32px;
}
.lm-viewer-error.show { display: flex; }
.lm-error-icon { font-size: 36px; }
.lm-error-msg {
  font-size: 13px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-muted);
  max-width: 360px;
  line-height: 1.6;
}

/* ── DOCX page container (docx-preview renders into this) ── */
.lm-docx-pages {
  display: none;
  flex: 1;
  overflow-y: auto;
  overflow-x: auto;
  background: #e8e8e8;  /* grey canvas like a real document reader */
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  padding: 24px 16px;
}

.lm-docx-pages.show { display: block; }

.lm-docx-pages::-webkit-scrollbar { width: 8px; height: 8px; }
.lm-docx-pages::-webkit-scrollbar-track { background: #d0d0d0; }
.lm-docx-pages::-webkit-scrollbar-thumb { background: #aaa; border-radius: 99px; }
.lm-docx-pages::-webkit-scrollbar-thumb:hover { background: #888; }

/* Inner scaling wrapper — zoom is applied here via JS (CSS zoom property) */
#lm-docx-inner {
  width: 100%;
  transform-origin: top center;
}

/* docx-preview wraps each page in .lm-docx-page section */
#lm-docx-inner .lm-docx-page {
  background: #fff;
  box-shadow: 0 2px 12px rgba(0,0,0,0.18);
  margin: 0 auto 20px;
  max-width: 100%;
}

/* ── PDF iframe ── */
#lm-viewer-iframe {
  display: none;
  flex: 1;
  width: 100%;
  height: 100%;
  border: none;
  background: #fff;
}
#lm-viewer-iframe.show { display: block; }

.lm-loader-spinner {
  width: 44px;
  height: 44px;
  border: 3px solid var(--border2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: lm-spin 0.8s linear infinite;
}

@keyframes lm-spin {
  to { transform: rotate(360deg); }
}

.lm-loader-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 600px) {
  .lm-viewer-title { font-size: 12px; }
  .lm-viewer-back span { display: none; }
  .lm-item-title { font-size: 13px; }
  .lm-zoom-label { display: none; }
}